VB for JavaScript

/*
these are common VB functions tyhat are not available in javascript
just include a refferance to the VB.js file in you header file.
script type="text/javascript" language="JavaScript" src="vb.js"
*/
//return the length of a string
function Len(string){
	var Len = string.length;
	return Len;
}
//return a number of characters from the right side of a string
function Right(string,count){
	var Start = Number(string.length) - Number(count);
	var End = Number(string.length);
	var Right = string.substring(Start,End);
	return Right;
}
//return a number of characters from the left side of a string
function Left(string,count){
	var End = Number(count);
	var Left = string.substring(0,End);
	return Left;
}
//return an array of string bits from a string
function Parse(string,deliminator){
	var Parse = string.split(deliminator);
	return Parse;
}
//find an instance of a characters in a string and return the integer possition
function inStr(start,string1,string2){
	if(start > 0){
		string1 = Right(string1,string1.length - start)
	}
	var inStr = string1.indexOf(string2);
	return inStr + 1;
}
//add a number of increments to month, day or year of a date
function AddDate(interval,increment,thedate){
	if(interval == ""){
	var AddDate = "You did not supply an interval.";
		return AddDate;
	}
	else if(increment == ""){
	var AddDate = "You did not supply an increment.";
		return AddDate;
	}
	else if(thedate == ""){
	var AddDate = "You did not supply a date.";
		return AddDate;
	}
	else{
		if(thedate.indexOf("/") != -1){
		var Deliminator = "/";
		}
		if(thedate.indexOf("-") != -1){
		var Deliminator = "-";
		}
		if(thedate.indexOf(".") != -1){
		var Deliminator = ".";
		}
		if(interval == "d"){
					var datepart = thedate.split(Deliminator);
					var olddate = new Date(datepart[2],(Number(datepart[0])-1),(Number(datepart[1])+Number(increment))); //up the day a interval number
					var AddDate = (olddate.getMonth()+1) + "/" + olddate.getDate() + "/" + olddate.getFullYear(); //format the date for return in the same format received in
					return AddDate;
		}
		if(interval == "m"){
					var datepart = thedate.split(Deliminator);
					var olddate = new Date(datepart[2],((Number(datepart[0])-1) + Number(increment)),(Number(datepart[1])-1)); //up the month a interval number
					var AddDate = (olddate.getMonth()+1) + "/" + (olddate.getDate()+1) + "/" + olddate.getFullYear(); //format the date for return in the same format received in
					return AddDate;
		}
		if(interval == "y"){
					var datepart = thedate.split(Deliminator);
					var olddate = new Date((Number(datepart[2]) + Number(increment)),(Number(datepart[0])-1),(Number(datepart[1])-1)); //up the year a interval number
					var AddDate = (olddate.getMonth()+1) + "/" + (olddate.getDate()+1) + "/" + olddate.getFullYear(); //format the date for return in the same format received in
					return AddDate;
		}
	}
}
//return the differance between two dates in days, months or years
function Datedif(interval,date1,date2){
	if(interval == ""){
		var Datedif = "You must supply an interval.";
		return Datedif;
	}
	else if(date1 == ""){
		var Datedif = "You must supply the first date.";
		return Datedif;
	}
	else if(date2 == ""){
		var Datedif = "You must supply the second date.";
		return Datedif;
	}
	else{
		if(interval == "d"){
			var datepart = date1.split("/");
			var dateone = new Date(datepart[2],datepart[0],datepart[1]);
			
			var datepart = date2.split("/");
			var datetwo = new Date(datepart[2],datepart[0],datepart[1]);
			
			var difference = dateone-datetwo;//unit is milliseconds
			var Datedif = Math.round(difference/1000/60/60/24); //now unit is days
			
			return Datedif;
		}
		else if(interval == "m"){
			var datepart1 = date1.split("/");
			var dateone = new Date(datepart1[2],datepart1[0]-1,datepart1[1]);
			
			var datepart2 = date2.split("/");
			var datetwo = new Date(datepart2[2],datepart2[0]-1,datepart2[1]);
			
			var Yeardif = (datetwo.getFullYear() - dateone.getFullYear()) * 12; //turn year diff into months
			var Monthdif = datetwo.getMonth() - dateone.getMonth(); // get months diff
			
			var Datedif = Yeardif + Monthdif; //add months
			
			return Datedif;
		}
		else if(interval == "y"){
			var datepart1 = date1.split("/");
			
			var datepart2 = date2.split("/");
			
			var Datedif = datepart2[2] - datepart1[2]; //get year diff
			
			return Datedif;
		}
	}
}
//End Of My VB Functions ---------------------------------------------------------------